<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-tabel
        class="treeTable"
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: green"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success" v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit"
            >编辑</el-button
          >
          <el-button size="mini" type="danger" icon="el-icon-delete"
            >删除</el-button
          >
        </template>
      </tree-tabel>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[5, 10, 15, 20]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类表单 -->
      <el-form
        :rules="addCateFormRules"
        ref="addCateFormRef"
        :model="addCateForm"
        label-width="100px"
      >
        <el-form-item label="分类名称: " prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类: ">
          <el-cascader
            v-model="selectedKeys"
            :options="ParentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      querInfo: {
        //分页属性
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      catelist: [], //商品分类的数据列表
      total: 0, //总数据条数
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ], //为tabel指定列
      addCateDialogVisible: false, //控制添加分类对话框
      addCateForm: {
        //添加分类表单数据
        cat_name: '', //将要添加分类的名称
        cat_pid: 0, //父分类Id
        cat_level: 0, //分级等级
      },
      addCateFormRules: {
        //表单输入验证规则
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      ParentCateList: [], //父级分类的列表
      cascaderProps: {//级联选择器的配置对象
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: [],//选中的父级分类ID数组
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.querInfo,
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品列表失败！");
      }
      console.log(res.data);
      this.catelist = res.data.result;
      this.total = res.data.total;
    },
    handleSizeChange(newSize) {
      //监听pagesize改变
      this.querInfo.pagesize = newSize;
      this.getCateList();
    },
    handleCurrentChange(newPage) {
      //监听pagenum改变
      this.querInfo.pagenum = newPage;
      this.getCateList();
    },
    showAddCateDialog() {
      //点击添加分类显示对话框
      this.getParentCateList(); //获取父级分类的数据列表
      this.addCateDialogVisible = true;
    },
    async getParentCateList() {
      //父级分类的数据列表
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据失败！");
      }
      console.log(res.data);
      this.ParentCateList = res.data;
    },
    parentCateChanged() {//选择发生变化触发该函数
      console.log(this.selectedKeys)
      if(this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[
        this.selectedKeys.length - 1 ]
        this.addCateForm.cat_level = this.selectedKeys.length
        return 
      }else{
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {//确定按钮添加新分类
      // console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async vaild => {
        if(!vaild) return
        const { data:res } = await this.$http.post('categories',this.addCateForm)
        if(res.meta.status !== 201) {
          return this.$message.error('获取分类失败！')
        }
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    addCateDialogClosed() {//重置添加分类表单数据
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
};
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>